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            <div class="post-description">介绍Java的八大基本数据类型</div>
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        <h1 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h1><p>本文将介绍Java的八大基本数据类型</p>
<hr>
<h1 id="Java八大基本数据类型"><a href="#Java八大基本数据类型" class="headerlink" title="Java八大基本数据类型"></a>Java八大基本数据类型</h1><table>
<thead>
<tr>
<th>Java基本数据类型</th>
<th>类型</th>
<th>封装器类</th>
<th>描述</th>
</tr>
</thead>
<tbody><tr>
<td>byte</td>
<td>整数类型</td>
<td>Byte</td>
<td>1字节，8位，最大存储数据量是255，存放的数据范围是-128~127之间。</td>
</tr>
<tr>
<td>short</td>
<td>整数类型</td>
<td>Short</td>
<td>2字节，16位，最大数据存储量是65536，数据范围是-32768~32767之间。</td>
</tr>
<tr>
<td>int</td>
<td>整数类型</td>
<td>Integer</td>
<td>4字节，32位，最大数据存储容量是2的32次方减1，数据范围是负的2的31次方到正的2的31次方减1。</td>
</tr>
<tr>
<td>long</td>
<td>整数类型</td>
<td>Long</td>
<td>8字节，64位，最大数据存储容量是2的64次方减1，数据范围为负的2的63次方到正的2的63次方减1。</td>
</tr>
<tr>
<td>float</td>
<td>浮点类型</td>
<td>Float</td>
<td>4字节，32位，数据范围在3.4e-45~1.4e38，直接赋值时必须在数字后加上<code>f</code>或<code>F</code>。</td>
</tr>
<tr>
<td>double</td>
<td>浮点类型</td>
<td>Double</td>
<td>8字节，64位，数据范围在4.9e-324~1.8e308，赋值时可以加<code>d</code>或<code>D</code>也可以不加。</td>
</tr>
<tr>
<td>char</td>
<td>字符型</td>
<td>Character</td>
<td>2字节，16位，存储<code>Unicode</code>码，用单引号赋值。</td>
</tr>
<tr>
<td>boolean</td>
<td>布尔型</td>
<td>Boolean</td>
<td>只有<code>true</code>和<code>false</code>两个取值</td>
</tr>
</tbody></table>
<h2 id="byte"><a href="#byte" class="headerlink" title="byte"></a>byte</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">byte</span> a = <span class="number">127</span>;</span><br><span class="line">System.out.println(a); <span class="comment">// 127</span></span><br><span class="line"><span class="keyword">byte</span> b = -<span class="number">128</span>;</span><br><span class="line">System.out.println(b); <span class="comment">// -128</span></span><br></pre></td></tr></table></figure>

<h2 id="short"><a href="#short" class="headerlink" title="short"></a>short</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">short</span> a = <span class="number">32767</span>;</span><br><span class="line">System.out.println(a); <span class="comment">// 32767</span></span><br><span class="line"><span class="keyword">short</span> b = -<span class="number">32768</span>;</span><br><span class="line">System.out.println(b); <span class="comment">// -32768</span></span><br></pre></td></tr></table></figure>

<h2 id="int"><a href="#int" class="headerlink" title="int"></a>int</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">int</span> a = <span class="number">1</span>;</span><br><span class="line">System.out.println(a); <span class="comment">// 1</span></span><br></pre></td></tr></table></figure>

<h2 id="long"><a href="#long" class="headerlink" title="long"></a>long</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">long</span> a = <span class="number">2</span>;</span><br><span class="line">System.out.println(a); <span class="comment">// 2</span></span><br></pre></td></tr></table></figure>

<h2 id="float"><a href="#float" class="headerlink" title="float"></a>float</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">float</span> a = <span class="number">1.2f</span>;</span><br><span class="line">System.out.println(a); <span class="comment">// 1.2</span></span><br></pre></td></tr></table></figure>

<h2 id="double"><a href="#double" class="headerlink" title="double"></a>double</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">double</span> a = <span class="number">1.4d</span>;</span><br><span class="line">System.out.println(a); <span class="comment">// 1.4</span></span><br></pre></td></tr></table></figure>

<h2 id="char"><a href="#char" class="headerlink" title="char"></a>char</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">char</span> a = <span class="string">&#x27;c&#x27;</span>;</span><br><span class="line">System.out.println(a); <span class="comment">// c</span></span><br></pre></td></tr></table></figure>

<h2 id="boolean"><a href="#boolean" class="headerlink" title="boolean"></a>boolean</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">boolean</span> a = <span class="keyword">true</span>;</span><br><span class="line">System.out.println(a); <span class="comment">// true</span></span><br></pre></td></tr></table></figure>

<hr>
<h1 id="数据类型转换"><a href="#数据类型转换" class="headerlink" title="数据类型转换"></a>数据类型转换</h1><p>合法的基本类型转换原则是指：从取值范围窄的类型向取值范围宽的类型转换。如果是从取值范围宽的类型向取值范围窄的类型转换，则会产生编译错误。 </p>
<p>转换规则：</p>
<ul>
<li>布尔型和其它基本数据类型之间不能相互转换</li>
<li>byte型可以转换为short、int、、long、float和double</li>
<li>short可转换为int、long、float和double</li>
<li>char可转换为int、long、float和double</li>
<li>int可转换为long、float和double</li>
<li>long可转换为float和double</li>
<li>float可转换为double</li>
</ul>
<p><strong>注意：类型强转可能会导致数据精度降低</strong></p>
<p>举例：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">float</span> a = <span class="number">50.4f</span>;</span><br><span class="line"><span class="keyword">int</span> b = (<span class="keyword">int</span>) a;</span><br><span class="line">System.out.println(b); <span class="comment">// 50</span></span><br></pre></td></tr></table></figure>

<hr>
<h1 id="结尾"><a href="#结尾" class="headerlink" title="结尾"></a>结尾</h1><p>在一般情况下不轻易使用数据类型转换，可能导致错误。</p>

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